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Refactor Frame#context to avoid reading whole file at once

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This commit is contained in:
Sijawusz Pur Rahnama 2021-01-10 15:02:20 +01:00
parent 1ff793f00b
commit 5e1ea0bd78
1 changed files with 14 additions and 8 deletions
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22
src/backtracer/backtrace/frame.cr
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@ -119,16 +119,22 @@ module Backtracer
return unless (lineno = @lineno) && (lineno > 0) return unless (lineno = @lineno) && (lineno > 0)
return unless (path = @path) && File.readable?(path) return unless (path = @path) && File.readable?(path)
lines = File.read_lines(path) context_line = nil
lineidx = lineno - 1 pre_context, post_context = %w[], %w[]
if context_line = lines[lineidx]? i = 0
pre_context_lines = File.each_line(path) do |line|
(lineno <= context_lines) ? lineidx : context_lines case i += 1
when lineno - context_lines...lineno
pre_context = lines[(lineidx - context_lines).clamp(0..), pre_context_lines] pre_context << line
post_context = lines[(lineidx + 1).clamp(..lines.size), context_lines] when lineno
context_line = line
when lineno + 1..lineno + context_lines
post_context << line
end
end
if context_line
@context_cache[context_lines] = @context_cache[context_lines] =
Context.new( Context.new(
lineno: lineno, lineno: lineno,